Well, that's not completely true -- each statement ends with a semi-colon.
A statement, in programming languages, is like a sentence in English, and we tend to put full-stops on the end of those to make things easier to understand.
Because computers are kind of stoopid, computer languages have the same idea. In Javascript, it's a semi-colon. Other computer languages use other methods, but the semi-colon is very common.
In English, you can have a sentence that goes over several lines, or you can have more than one sentence on a line. It's the same with computer languages and statements, but for clarity we tend to put each one on its own line.
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